US8974193B2 - Synthetic jet equipment - Google Patents

Abstract

A synthetic jet equipment is provided, including a base, a frame fixed to the base, a first member, a pump diaphragm, a second member, and a valve diaphragm. The pump diaphragm connects the first member to the frame, and the valve diaphragm connects the second member to the frame. The base, the frame, the first member, the pump diaphragm, the second member, and the valve diaphragm define a chamber forming an intake and an outlet. When the first member moves in a first direction, the second member moves in a second direction opposite to the first direction and the external air flows into the chamber through the inlet. When the first member moves in the second direction, the second member moves in the first direction, such that the air is exhausted from the chamber through the outlet.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of Taiwan Patent Application No. 101119481, filed on May 31, 2012, the entirety of which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The disclosure relates to synthetic jet equipment, and relates to heat dissipation in synthetic jet equipment.

BACKGROUND

The synthetic jet can provide turbulent flow for heat dissipation, which has better convectional efficiency when compared to a laminar flow. The conventional synthetic jet actuator comprises a chamber, a diaphragm, and an outlet. When the diaphragm moves upward and compresses the chamber during vibration, air is ejected through the outlet from the chamber and forms the synthetic jet. When the diaphragm moves downward, air is drawn into the chamber. With repeated vibrations, the actuator can eject incontinuous synthetic jet. However, since the outlet of the conventional synthetic jet actuator is also usually used as an intake, the ejected air may be drawn back into the chamber, such that the heat transfer efficiency may be hampered.

Additionally, the conventional synthetic jet actuator may be combined with a cooler (such as fins), to form a heat dissipation mechanism. Though conventional synthetic jet actuators can eject air to dissipate heat via fins, some of the heated air will be drawn back into the chamber, thus, causing temperatures inside of the chamber to rise, thus, decreasing heat dissipation efficiency.

SUMMARY

The disclosure provides a synthetic jet equipment, comprising a base, a frame fixed to the base, a first member, a pump diaphragm, a second member, and a valve diaphragm. The pump diaphragm connects the first member to the frame, and the valve diaphragm connects the second member to the frame. The base, the frame, the first member, the pump diaphragm, the second member, and the valve diaphragm define a chamber forming an intake and an outlet. When the first member moves in a first direction, the second member moves in a second direction opposite to the first direction, and the external air flows into the chamber through the inlet. When the first member moves in the second direction, the second member moves in the first direction, such that the air is exhausted from the chamber through the outlet

A detailed description is given in the following embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 is a perspective diagram showing a synthetic jet equipment according to an embodiment of the disclosure;

FIG. 2 is a sectional view of a synthetic jet equipment according to an embodiment of the disclosure;

FIG. 3 is a sectional view showing of a synthetic jet equipment in an inspiratory state according to an embodiment of the disclosure;

FIG. 4 is a sectional view showing of a synthetic jet equipment in an aspiratory state according to an embodiment of the disclosure;

FIG. 5 is a perspective diagram showing a synthetic jet equipment according to another embodiment of the disclosure;

FIG. 6 is a sectional view of a synthetic jet equipment according to another embodiment of the disclosure; and

FIG. 7 is a sectional view of a synthetic jet equipment according to another embodiment of the disclosure;

DETAILED DESCRIPTION OF THE DISCLOSURE

Referring toFIG. 1 andFIG. 2, an embodiment of the disclosure provides asynthetic jet equipment10 comprising abase15, aframe20, aholder21, afirst member41, apump diaphragm42, asecond member51, avalve diaphragm52, amagnetic unit60, and aheat exchanger70. As shown inFIG. 1 andFIG. 2, theheat exchanger70 is disposed below thebase15, and thesecond member51, theframe20, themagnetic unit60 in theframe20, and thefirst member41 are disposed above thebase15. A fixedmember25 is disposed on thebase15, and thevalve diaphragm52 connects the fixedmember25 to an edge of thesecond member51. Theframe20, thesecond member51, and thebase15 are separated from each other and between a bottom edge of theframe20 and thesecond member51, thebase15 form a gap for drawing air into theframe20. Theholder21 is fixed to the heat exchanger70 (as shown inFIG. 1 andFIG. 5) and extended through theframe20 to fix themagnetic unit60 in theframe20. Thus, themagnetic unit60 can be positioned between thefirst member41 and thesecond member51. In some embodiments, themagnetic unit60 may be a permanent magnet with N and S poles.

As shown inFIG. 2, thepump diaphragm42 surrounds thefirst member41 and connects thefirst member41 with an upper edge of theframe20. Afirst coil43 is disposed in thefirst member41 and surrounds an edge of themagnetic unit60, such as the edge of the N pole. Thefirst coil43 may be disposed on afirst surface40 of thefirst member41. In some embodiments, thefirst coil43 and thefirst member41 may be integrally formed in one piece. A throughhole54 is formed at the center of thesecond member51, and thevalve diaphragm52 connects thesecond member51 to the fixedmember25. Asecond coil53 is disposed in thesecond member51 and surrounds an edge of themagnetic unit60, such as the edge of the S pole. Thesecond coil53 may be disposed on asecond surface50 of thesecond member51. In some embodiments, thesecond coil53 and thesecond member51 may be integrally formed in one piece. The wires extended from thefirst coil43 and thesecond coil53 can be guided along theholder21 to an external power source.

Theframe20, thefirst member41, thesecond member51, thepump diaphragm42, and thevalve diaphragm52 define achamber30 therebetween, wherein anintake31 is formed between theframe20 and thesecond member51, and anoutlet32 is formed on thebase15. Afirst flow channel73 is formed between thebase15 and thesecond member51 to communicate the throughhole54 to theoutlet32.

As shown inFIG. 1 andFIG. 2, theheat exchanger70 connects to thebase15 and forms a plurality offins77 surrounding thebase15. Theheat exchanger70 is positioned under thebase15. Thebase15 has a circular structure, wherein thefins77 are radically disposed under thebase15. Thefins77 are equidistant annularity arrangement. During usage, the bottom of theheat exchanger70 may connect to a heat source, such as an LED, and the heat can be dissipated by thefins77 surrounding theheat exchanger70. In some embodiments, thebase15 and theheat exchanger70 may be integrally formed in one piece.

The mechanism of themagnetic unit60, thefirst member41, thefirst coil43, thesecond member51, and thesecond coil53 inFIG. 3 will be described below. When an alternating current is applied to thefirst coil43 and thesecond coil53, the magnetic field caused by the current can influence themagnetic unit60 by a magnetic force (Lorentz force) upward or downward. When the current direction of thefirst coil43 is as shown inFIG. 3, thefirst coil43 and themagnetic unit60 produce a repulsion force (first magnetic force) therebetween, such that thepump diaphragm42 and thefirst member41 move in a first direction A1, and air is drawn into thechamber30 through theintake31, as the arrow S1 indicates inFIG. 3.

Similarly, when the current direction applied to thesecond coil53 is as shown inFIG. 3, thesecond coil53 and themagnetic unit60 generate a repulsion force (second magnetic force) therebetween, such that thevalve diaphragm52 and thesecond member51 move in a second direction A2. When thesecond member51 moves in the second direction A2, theoutlet32 of thebase15 can be closed. When thefirst member41 moves in the first direction A1, and thesecond member51 moves in the second direction A2, air can be drawn into thechamber30 through theintake31, such that thesynthetic jet equipment10 is in an inspiratory state.

As shown inFIG. 4, when the phase of the alternative current changes, the current directions of thefirst coil43 and thesecond coil53 are reversed, and thefirst coil43 and themagnetic unit60 may have an attraction force (third magnetic force) therebetween. Thus, thepump diaphragm42 and thefirst member41 may move in the second direction A2. Similarly, when the current direction of thesecond coil53 reverses as shown inFIG. 4, thesecond coil53 and themagnetic unit60 produce an attraction force (fourth magnetic force) therebetween, and thevalve diaphragm52 and thesecond member51 move in the first direction A1.

When thepump diaphragm42 and thefirst member41 move in the second direction A2, thechamber30 is compressed, and air in thechamber30 is ejected through the throughhole54 of the center of thesecond member51, thefirst flow channel73, and theoutlet32, so as to form a synthetic jet. The synthetic jet may be guided through asecond flow channel75 in thebase15 to theheat exchanger70 for heat exchange, as the arrow S2 indicates inFIG. 4, wherein thesecond flow channel75 extends through thebase15.

As shown inFIG. 4, when thesecond member51 moves in the first direction A1, theintake31 is closed, such that air in thechamber30 is ejected through the throughhole54 of a center of thesecond member51, afirst flow channel73, theoutlet32, and thesecond flow channel75, and thesynthetic jet equipment10 is in an aspiratory state. In other words, when thefirst member41 and thesecond member51 move in the second direction A2 and the first direction A1 respectively, air in thechamber30 can be ejected to produce the synthetic jet without external air flowing into thechamber30.

Referring toFIG. 5 andFIG. 6, another embodiment of the disclosure provides asynthetic jet equipment10 similar to the aforesaid embodiments (FIGS. 1-3). The differences between the present embodiment from theFIGS. 1-3 is that thebase15 ofFIGS. 5 and 6 has the same height with theheat exchanger70, wherein thebase15 and theheat exchanger70 can be integrally formed in one piece. InFIG. 6, thesecond flow channel75 is disposed in thebase15, and anozzle71 is formed on a side of thesecond flow channel75. The synthetic jet from theoutlet32 can be horizontally ejected and guided through thesecond flow channel75 and thenozzle71 to dissipate heat via thefins77 surrounding theheat exchanger70. As shown inFIG. 5 andFIG. 6, thefins77 are radically arranged surround and under thebase15 and separated from each other by the same distance. Here, thesecond flow channel75 is not extended through thebase15.

In this embodiment, thefirst member41, thefirst coil43, thepump diaphragm42, thesecond member51, thesecond coil53, thevalve diaphragm52, and themagnetic unit60 have the same mechanism asFIGS. 1-3. In some embodiments, an alternating current with a frequency may be applied to thefirst coil43 and thesecond coil53, such that thepump diaphragm42, thevalve diaphragm52, thefirst member41, and thesecond member51 can periodically vibrate. Furthermore, thefirst coil43 and thesecond coil53 may be respectively connected to an independently driven circuit to control the motions of thefirst member41 and thesecond member51.

Referring toFIG. 7, in another embodiment of thesynthetic jet equipment10, afirst magnet46 and asecond magnet56 are respectively fixed to thefirst member41 and thesecond member51, and acoil unit61 is fixed to theholder21, wherein thecoil unit61 is disposed between thefirst magnet46 and thesecond magnet56. When an alternating current is applied to thecoil unit61, the current induces an magnetic field influencing thefirst magnet46 and thesecond magnet56 by an attractive force or repulsive force, to drive thefirst magnet46 and thesecond magnet56 moving upward (first direction A1) or downward (second direction A2). Thus, thepump diaphragm42, thevalve diaphragm52, thefirst member41, and thesecond member51 can produce periodic vibrations to generate a synthetic jet.

The disclosure provides a synthetic jet equipment having an intake and an outlet, preventing external air from drawing back into the chamber after heat exchange. Compared to the conventional synthetic jet actuator, the disclosure can always eject cold air and improve the efficiency of heat exchange.

While the disclosure has been described by way of example and in terms of the preferred embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Claims (13)

What is claimed is:

1. A synthetic jet equipment, comprising:

a base;

a frame, disposed upon the base;

a first member;

a pump diaphragm, connecting the first member to the frame;

a second member, disposed between the base and the frame;

a valve diaphragm, connecting the second member to the base and vibrating corresponding to a vibration of the pump diaphragm, wherein the base, the frame, the first member, the second member, the pump diaphragm, and the valve diaphragm form a chamber, and the chamber includes an intake and an outlet,

wherein when the first member moves in a first direction, the second member moves in a second direction and blocks the outlet, and air flows into the chamber through the intake, and wherein the first direction is opposite to the second direction,

wherein when the first member moves in the second direction, the second member moves in the first direction to block the intake, and the air is ejected from the outlet.

2. The synthetic jet equipment as claimed inclaim 1, wherein the intake is formed between the second member and the frame, and the outlet is formed on the base.

3. The synthetic jet equipment as claimed inclaim 1, wherein the synthetic jet equipment further comprises a heat exchanger, and the heat exchanger connects to the base and forms a plurality of fins.

4. The synthetic jet equipment as claimed inclaim 1, wherein the pump diaphragm surrounds the first member, and the valve diaphragm surrounds the second member, and the second member has a through hole, and the air flows into the chamber through the intake and flows out sequentially through the through hole and the outlet.

5. The synthetic jet equipment as claimed inclaim 1, wherein the synthetic jet equipment further comprises a magnetic unit, a first coil, and a second coil, and the magnetic unit is fixed to the frame and disposed between the first member and the second member, and the first coil and the second coil are respectively disposed on the first member and the second member and surround the magnetic unit.

6. The synthetic jet equipment as claimed inclaim 5, wherein the synthetic jet equipment further comprises a holder, and the holder is fixed to the base and connected to the frame and the magnetic unit for fixing the magnetic unit in the frame.

7. The synthetic jet equipment as claimed inclaim 5, wherein the magnetic unit comprises a permanent magnet.

8. The synthetic jet equipment as claimed inclaim 5, wherein an alternating current is applied to the first coil and the second coil to produce periodic vibrations of the pump diaphragm, the valve diaphragm, the first member, and the second member.

9. The synthetic jet equipment as claimed inclaim 8, wherein when a first magnetic force is applied to the first coil, the pump diaphragm and the first member move in the first direction, and when a second magnetic force is applied to the second coil, the valve diaphragm and the second member move in the second direction.

10. The synthetic jet equipment as claimed inclaim 9, wherein when a third magnetic force is applied to the first coil, the pump diaphragm and the first member move in the second direction, and when the a fourth magnetic force is applied to the second coil, the valve diaphragm and the second member move in the first direction.

11. The synthetic jet equipment as claimed inclaim 1, wherein the synthetic jet equipment further comprises a coil unit, a first magnet, and a second magnet, and the first magnet and the second magnet are respectively disposed on the first member and the second member, and the coil unit is fixed to the frame and disposed between the first magnet and the second magnet.

12. The synthetic jet equipment as claimed inclaim 11, wherein the synthetic jet equipment further comprises a holder, fixed to the base and connected to the frame and the coil unit, to hold the coil unit in the frame.

13. The synthetic jet equipment as claimed inclaim 11, wherein an alternating current is applied to the coil unit to produce periodic vibrations of the pump diaphragm, the valve diaphragm, the first member, and the second member.

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